Table 3. Free amino acid contents in plum juice and vinegar

Free amino acids (mg/100 g)	Sample
Free amino acids (mg/100 g)	Plum juice	Plum vinegar
Phosphoserine	3.20±0.70^1)ns2)	3.26±0.07
Taurine	4.10±0.60^b3)	6.91±0.07^a
Phosphoethanolamine	3.65±0.40^ns	3.99±0.47
Aspartic acid	0.89±0.10^b	10.10±0.38^a
Threonine	0.35±0.00^b	4.73±0.25^a
Glutamic acid	1.03±0.20^b	4.72±0.25^a
Theanine	0.00±0.00^ns	0.11±0.18
α-Aminoadipic acid	0.08±0.20^ns	0.00±0.00
Glycine	0.40±0.10^b	5.64±0.13^a
Alanine	0.66±0.20^b	67.86±1.90^a
Valine	1.41±0.00^b	4.26±0.42^a
Cystine	1.22±0.40^ns	1.08±0.36
Methionine	0.00±0.00^b	0.81±0.28^a
Isoleucine	0.11±0.10^b	2.55±0.15^a
Leucine	0.32±0.00^b	6.33±0.29^a
Tyrosine	1.38±1.40^b	4.71±1.00^a
Phenylalanine	0.29±0.70^b	4.69±0.20^a
β-Alanine	0.23±0.40^b	1.71±0.31^a
β-Amino isobutyric acid	0.00±0.00^b	0.54±0.33^a
GABA	1.85±0.20^b	7.28±0.22^a
Histidine	0.08±0.10^b	2.80±0.55^a
1-Methylhistidine	0.03±0.10^ns	0.00±0.00
Tryptophan	0.17±0.40^ns	0.44±0.45
Ornithine	0.50±0.20^b	4.70±0.34^a
Lysine	0.13±0.10^b	8.90±0.74^a
Ammonia	12.95±1.00^b	46.46±3.68^a
Arginine	1.71±2.10^b	8.60±0.93^a
Total	39.00±4.70^b	219.00±5.07^a

All values are mean±SD (n=3).
ns, not significant.
Means with different superscript letters (^a,b) in the same row are significantly different at p<0.05 by Duncan’s multiple range test.